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3d218156f8
llvm-6502/lib/Object/MachOObjectFile.cpp
Rafael Espindola 3d218156f8 Be a bit more consistent about using ErrorOr when constructing Binary objects. 
The constructors of classes deriving from Binary normally take an error_code
as an argument to the constructor. My original intent was to change them
to have a trivial constructor and move the initial parsing logic to a static
method returning an ErrorOr. I changed my mind because:

* A constructor with an error_code out parameter is extremely convenient from
  the implementation side. We can incrementally construct the object and give
  up when we find an error.
* It is very efficient when constructing on the stack or when there is no
  error. The only inefficient case is where heap allocating and an error is
  found (we have to free the memory).

The result is that this is a much smaller patch. It just standardizes the
create* helpers to return an ErrorOr.

Almost no functionality change: The only difference is that this found that
we were trying to read past the end of COFF import library but ignoring the
error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199770 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-21 23:06:54 +00:00

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//===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the MachOObjectFile class, which binds the MachOObject
// class to the generic ObjectFile wrapper.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/MachO.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
#include <cstring>
#include <limits>
using namespace llvm;
using namespace object;
namespace llvm {
namespace object {
struct nlist_base {
uint32_t n_strx;
uint8_t n_type;
uint8_t n_sect;
uint16_t n_desc;
};
struct section_base {
char sectname[16];
char segname[16];
};
template<typename T>
static void SwapValue(T &Value) {
Value = sys::SwapByteOrder(Value);
}
template<typename T>
static void SwapStruct(T &Value);
template<>
void SwapStruct(MachO::any_relocation_info &H) {
SwapValue(H.r_word0);
SwapValue(H.r_word1);
}
template<>
void SwapStruct(MachO::load_command &L) {
SwapValue(L.cmd);
SwapValue(L.cmdsize);
}
template<>
void SwapStruct(nlist_base &S) {
SwapValue(S.n_strx);
SwapValue(S.n_desc);
}
template<>
void SwapStruct(MachO::section &S) {
SwapValue(S.addr);
SwapValue(S.size);
SwapValue(S.offset);
SwapValue(S.align);
SwapValue(S.reloff);
SwapValue(S.nreloc);
SwapValue(S.flags);
SwapValue(S.reserved1);
SwapValue(S.reserved2);
}
template<>
void SwapStruct(MachO::section_64 &S) {
SwapValue(S.addr);
SwapValue(S.size);
SwapValue(S.offset);
SwapValue(S.align);
SwapValue(S.reloff);
SwapValue(S.nreloc);
SwapValue(S.flags);
SwapValue(S.reserved1);
SwapValue(S.reserved2);
SwapValue(S.reserved3);
}
template<>
void SwapStruct(MachO::nlist &S) {
SwapValue(S.n_strx);
SwapValue(S.n_desc);
SwapValue(S.n_value);
}
template<>
void SwapStruct(MachO::nlist_64 &S) {
SwapValue(S.n_strx);
SwapValue(S.n_desc);
SwapValue(S.n_value);
}
template<>
void SwapStruct(MachO::mach_header &H) {
SwapValue(H.magic);
SwapValue(H.cputype);
SwapValue(H.cpusubtype);
SwapValue(H.filetype);
SwapValue(H.ncmds);
SwapValue(H.sizeofcmds);
SwapValue(H.flags);
}
template<>
void SwapStruct(MachO::mach_header_64 &H) {
SwapValue(H.magic);
SwapValue(H.cputype);
SwapValue(H.cpusubtype);
SwapValue(H.filetype);
SwapValue(H.ncmds);
SwapValue(H.sizeofcmds);
SwapValue(H.flags);
SwapValue(H.reserved);
}
template<>
void SwapStruct(MachO::symtab_command &C) {
SwapValue(C.cmd);
SwapValue(C.cmdsize);
SwapValue(C.symoff);
SwapValue(C.nsyms);
SwapValue(C.stroff);
SwapValue(C.strsize);
}
template<>
void SwapStruct(MachO::dysymtab_command &C) {
SwapValue(C.cmd);
SwapValue(C.cmdsize);
SwapValue(C.ilocalsym);
SwapValue(C.nlocalsym);
SwapValue(C.iextdefsym);
SwapValue(C.nextdefsym);
SwapValue(C.iundefsym);
SwapValue(C.nundefsym);
SwapValue(C.tocoff);
SwapValue(C.ntoc);
SwapValue(C.modtaboff);
SwapValue(C.nmodtab);
SwapValue(C.extrefsymoff);
SwapValue(C.nextrefsyms);
SwapValue(C.indirectsymoff);
SwapValue(C.nindirectsyms);
SwapValue(C.extreloff);
SwapValue(C.nextrel);
SwapValue(C.locreloff);
SwapValue(C.nlocrel);
}
template<>
void SwapStruct(MachO::linkedit_data_command &C) {
SwapValue(C.cmd);
SwapValue(C.cmdsize);
SwapValue(C.dataoff);
SwapValue(C.datasize);
}
template<>
void SwapStruct(MachO::segment_command &C) {
SwapValue(C.cmd);
SwapValue(C.cmdsize);
SwapValue(C.vmaddr);
SwapValue(C.vmsize);
SwapValue(C.fileoff);
SwapValue(C.filesize);
SwapValue(C.maxprot);
SwapValue(C.initprot);
SwapValue(C.nsects);
SwapValue(C.flags);
}
template<>
void SwapStruct(MachO::segment_command_64 &C) {
SwapValue(C.cmd);
SwapValue(C.cmdsize);
SwapValue(C.vmaddr);
SwapValue(C.vmsize);
SwapValue(C.fileoff);
SwapValue(C.filesize);
SwapValue(C.maxprot);
SwapValue(C.initprot);
SwapValue(C.nsects);
SwapValue(C.flags);
}
template<>
void SwapStruct(uint32_t &C) {
SwapValue(C);
}
template<>
void SwapStruct(MachO::linker_options_command &C) {
SwapValue(C.cmd);
SwapValue(C.cmdsize);
SwapValue(C.count);
}
template<>
void SwapStruct(MachO::data_in_code_entry &C) {
SwapValue(C.offset);
SwapValue(C.length);
SwapValue(C.kind);
}
template<typename T>
T getStruct(const MachOObjectFile *O, const char *P) {
T Cmd;
memcpy(&Cmd, P, sizeof(T));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
SwapStruct(Cmd);
return Cmd;
}
static uint32_t
getSegmentLoadCommandNumSections(const MachOObjectFile *O,
const MachOObjectFile::LoadCommandInfo &L) {
if (O->is64Bit()) {
MachO::segment_command_64 S = O->getSegment64LoadCommand(L);
return S.nsects;
}
MachO::segment_command S = O->getSegmentLoadCommand(L);
return S.nsects;
}
static const char *
getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
unsigned Sec) {
uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
bool Is64 = O->is64Bit();
unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
sizeof(MachO::segment_command);
unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
sizeof(MachO::section);
uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
return reinterpret_cast<const char*>(SectionAddr);
}
static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
return O->getData().substr(Offset, 1).data();
}
static nlist_base
getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<nlist_base>(O, P);
}
static StringRef parseSegmentOrSectionName(const char *P) {
if (P[15] == 0)
// Null terminated.
return P;
// Not null terminated, so this is a 16 char string.
return StringRef(P, 16);
}
// Helper to advance a section or symbol iterator multiple increments at a time.
template<class T>
static error_code advance(T &it, size_t Val) {
error_code ec;
while (Val--) {
it.increment(ec);
}
return ec;
}
template<class T>
static void advanceTo(T &it, size_t Val) {
if (error_code ec = advance(it, Val))
report_fatal_error(ec.message());
}
static unsigned getCPUType(const MachOObjectFile *O) {
return O->getHeader().cputype;
}
static void printRelocationTargetName(const MachOObjectFile *O,
const MachO::any_relocation_info &RE,
raw_string_ostream &fmt) {
bool IsScattered = O->isRelocationScattered(RE);
// Target of a scattered relocation is an address. In the interest of
// generating pretty output, scan through the symbol table looking for a
// symbol that aligns with that address. If we find one, print it.
// Otherwise, we just print the hex address of the target.
if (IsScattered) {
uint32_t Val = O->getPlainRelocationSymbolNum(RE);
error_code ec;
for (symbol_iterator SI = O->begin_symbols(), SE = O->end_symbols();
SI != SE; SI.increment(ec)) {
if (ec) report_fatal_error(ec.message());
uint64_t Addr;
StringRef Name;
if ((ec = SI->getAddress(Addr)))
report_fatal_error(ec.message());
if (Addr != Val) continue;
if ((ec = SI->getName(Name)))
report_fatal_error(ec.message());
fmt << Name;
return;
}
// If we couldn't find a symbol that this relocation refers to, try
// to find a section beginning instead.
for (section_iterator SI = O->begin_sections(), SE = O->end_sections();
SI != SE; SI.increment(ec)) {
if (ec) report_fatal_error(ec.message());
uint64_t Addr;
StringRef Name;
if ((ec = SI->getAddress(Addr)))
report_fatal_error(ec.message());
if (Addr != Val) continue;
if ((ec = SI->getName(Name)))
report_fatal_error(ec.message());
fmt << Name;
return;
}
fmt << format("0x%x", Val);
return;
}
StringRef S;
bool isExtern = O->getPlainRelocationExternal(RE);
uint64_t Val = O->getPlainRelocationSymbolNum(RE);
if (isExtern) {
symbol_iterator SI = O->begin_symbols();
advanceTo(SI, Val);
SI->getName(S);
} else {
section_iterator SI = O->begin_sections();
// Adjust for the fact that sections are 1-indexed.
advanceTo(SI, Val - 1);
SI->getName(S);
}
fmt << S;
}
static uint32_t
getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
return RE.r_word0;
}
static unsigned
getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
return RE.r_word0 & 0xffffff;
}
static bool getPlainRelocationPCRel(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
if (O->isLittleEndian())
return (RE.r_word1 >> 24) & 1;
return (RE.r_word1 >> 7) & 1;
}
static bool
getScatteredRelocationPCRel(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
return (RE.r_word0 >> 30) & 1;
}
static unsigned getPlainRelocationLength(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
if (O->isLittleEndian())
return (RE.r_word1 >> 25) & 3;
return (RE.r_word1 >> 5) & 3;
}
static unsigned
getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
return (RE.r_word0 >> 28) & 3;
}
static unsigned getPlainRelocationType(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
if (O->isLittleEndian())
return RE.r_word1 >> 28;
return RE.r_word1 & 0xf;
}
static unsigned
getScatteredRelocationType(const MachO::any_relocation_info &RE) {
return (RE.r_word0 >> 24) & 0xf;
}
static uint32_t getSectionFlags(const MachOObjectFile *O,
DataRefImpl Sec) {
if (O->is64Bit()) {
MachO::section_64 Sect = O->getSection64(Sec);
return Sect.flags;
}
MachO::section Sect = O->getSection(Sec);
return Sect.flags;
}
MachOObjectFile::MachOObjectFile(MemoryBuffer *Object,
bool IsLittleEndian, bool Is64bits,
error_code &ec)
: ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
SymtabLoadCmd(NULL), DysymtabLoadCmd(NULL), DataInCodeLoadCmd(NULL) {
uint32_t LoadCommandCount = this->getHeader().ncmds;
MachO::LoadCommandType SegmentLoadType = is64Bit() ?
MachO::LC_SEGMENT_64 : MachO::LC_SEGMENT;
MachOObjectFile::LoadCommandInfo Load = getFirstLoadCommandInfo();
for (unsigned I = 0; ; ++I) {
if (Load.C.cmd == MachO::LC_SYMTAB) {
assert(!SymtabLoadCmd && "Multiple symbol tables");
SymtabLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
assert(!DysymtabLoadCmd && "Multiple dynamic symbol tables");
DysymtabLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
assert(!DataInCodeLoadCmd && "Multiple data in code tables");
DataInCodeLoadCmd = Load.Ptr;
} else if (Load.C.cmd == SegmentLoadType) {
uint32_t NumSections = getSegmentLoadCommandNumSections(this, Load);
for (unsigned J = 0; J < NumSections; ++J) {
const char *Sec = getSectionPtr(this, Load, J);
Sections.push_back(Sec);
}
}
if (I == LoadCommandCount - 1)
break;
else
Load = getNextLoadCommandInfo(Load);
}
}
error_code MachOObjectFile::getSymbolNext(DataRefImpl Symb,
SymbolRef &Res) const {
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
Symb.p += SymbolTableEntrySize;
Res = SymbolRef(Symb, this);
return object_error::success;
}
error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
StringRef &Res) const {
StringRef StringTable = getStringTableData();
nlist_base Entry = getSymbolTableEntryBase(this, Symb);
const char *Start = &StringTable.data()[Entry.n_strx];
Res = StringRef(Start);
return object_error::success;
}
error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
uint64_t &Res) const {
if (is64Bit()) {
MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
Res = Entry.n_value;
} else {
MachO::nlist Entry = getSymbolTableEntry(Symb);
Res = Entry.n_value;
}
return object_error::success;
}
error_code
MachOObjectFile::getSymbolFileOffset(DataRefImpl Symb,
uint64_t &Res) const {
nlist_base Entry = getSymbolTableEntryBase(this, Symb);
getSymbolAddress(Symb, Res);
if (Entry.n_sect) {
uint64_t Delta;
DataRefImpl SecRel;
SecRel.d.a = Entry.n_sect-1;
if (is64Bit()) {
MachO::section_64 Sec = getSection64(SecRel);
Delta = Sec.offset - Sec.addr;
} else {
MachO::section Sec = getSection(SecRel);
Delta = Sec.offset - Sec.addr;
}
Res += Delta;
}
return object_error::success;
}
error_code MachOObjectFile::getSymbolAlignment(DataRefImpl DRI,
uint32_t &Result) const {
uint32_t flags;
this->getSymbolFlags(DRI, flags);
if (flags & SymbolRef::SF_Common) {
nlist_base Entry = getSymbolTableEntryBase(this, DRI);
Result = 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
} else {
Result = 0;
}
return object_error::success;
}
error_code MachOObjectFile::getSymbolSize(DataRefImpl DRI,
uint64_t &Result) const {
uint64_t BeginOffset;
uint64_t EndOffset = 0;
uint8_t SectionIndex;
nlist_base Entry = getSymbolTableEntryBase(this, DRI);
uint64_t Value;
getSymbolAddress(DRI, Value);
BeginOffset = Value;
SectionIndex = Entry.n_sect;
if (!SectionIndex) {
uint32_t flags = SymbolRef::SF_None;
this->getSymbolFlags(DRI, flags);
if (flags & SymbolRef::SF_Common)
Result = Value;
else
Result = UnknownAddressOrSize;
return object_error::success;
}
// Unfortunately symbols are unsorted so we need to touch all
// symbols from load command
error_code ec;
for (symbol_iterator I = begin_symbols(), E = end_symbols(); I != E;
I.increment(ec)) {
DataRefImpl DRI = I->getRawDataRefImpl();
Entry = getSymbolTableEntryBase(this, DRI);
getSymbolAddress(DRI, Value);
if (Entry.n_sect == SectionIndex && Value > BeginOffset)
if (!EndOffset || Value < EndOffset)
EndOffset = Value;
}
if (!EndOffset) {
uint64_t Size;
DataRefImpl Sec;
Sec.d.a = SectionIndex-1;
getSectionSize(Sec, Size);
getSectionAddress(Sec, EndOffset);
EndOffset += Size;
}
Result = EndOffset - BeginOffset;
return object_error::success;
}
error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
SymbolRef::Type &Res) const {
nlist_base Entry = getSymbolTableEntryBase(this, Symb);
uint8_t n_type = Entry.n_type;
Res = SymbolRef::ST_Other;
// If this is a STAB debugging symbol, we can do nothing more.
if (n_type & MachO::N_STAB) {
Res = SymbolRef::ST_Debug;
return object_error::success;
}
switch (n_type & MachO::N_TYPE) {
case MachO::N_UNDF :
Res = SymbolRef::ST_Unknown;
break;
case MachO::N_SECT :
Res = SymbolRef::ST_Function;
break;
}
return object_error::success;
}
error_code MachOObjectFile::getSymbolFlags(DataRefImpl DRI,
uint32_t &Result) const {
nlist_base Entry = getSymbolTableEntryBase(this, DRI);
uint8_t MachOType = Entry.n_type;
uint16_t MachOFlags = Entry.n_desc;
// TODO: Correctly set SF_ThreadLocal
Result = SymbolRef::SF_None;
if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
Result |= SymbolRef::SF_Undefined;
if (MachOType & MachO::N_STAB)
Result |= SymbolRef::SF_FormatSpecific;
if (MachOType & MachO::N_EXT) {
Result |= SymbolRef::SF_Global;
if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
uint64_t Value;
getSymbolAddress(DRI, Value);
if (Value)
Result |= SymbolRef::SF_Common;
}
}
if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
Result |= SymbolRef::SF_Weak;
if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
Result |= SymbolRef::SF_Absolute;
return object_error::success;
}
error_code
MachOObjectFile::getSymbolSection(DataRefImpl Symb,
section_iterator &Res) const {
nlist_base Entry = getSymbolTableEntryBase(this, Symb);
uint8_t index = Entry.n_sect;
if (index == 0) {
Res = end_sections();
} else {
DataRefImpl DRI;
DRI.d.a = index - 1;
Res = section_iterator(SectionRef(DRI, this));
}
return object_error::success;
}
error_code MachOObjectFile::getSymbolValue(DataRefImpl Symb,
uint64_t &Val) const {
report_fatal_error("getSymbolValue unimplemented in MachOObjectFile");
}
error_code MachOObjectFile::getSectionNext(DataRefImpl Sec,
SectionRef &Res) const {
Sec.d.a++;
Res = SectionRef(Sec, this);
return object_error::success;
}
error_code
MachOObjectFile::getSectionName(DataRefImpl Sec, StringRef &Result) const {
ArrayRef<char> Raw = getSectionRawName(Sec);
Result = parseSegmentOrSectionName(Raw.data());
return object_error::success;
}
error_code
MachOObjectFile::getSectionAddress(DataRefImpl Sec, uint64_t &Res) const {
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Res = Sect.addr;
} else {
MachO::section Sect = getSection(Sec);
Res = Sect.addr;
}
return object_error::success;
}
error_code
MachOObjectFile::getSectionSize(DataRefImpl Sec, uint64_t &Res) const {
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Res = Sect.size;
} else {
MachO::section Sect = getSection(Sec);
Res = Sect.size;
}
return object_error::success;
}
error_code
MachOObjectFile::getSectionContents(DataRefImpl Sec, StringRef &Res) const {
uint32_t Offset;
uint64_t Size;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Offset = Sect.offset;
Size = Sect.size;
} else {
MachO::section Sect = getSection(Sec);
Offset = Sect.offset;
Size = Sect.size;
}
Res = this->getData().substr(Offset, Size);
return object_error::success;
}
error_code
MachOObjectFile::getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const {
uint32_t Align;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Align = Sect.align;
} else {
MachO::section Sect = getSection(Sec);
Align = Sect.align;
}
Res = uint64_t(1) << Align;
return object_error::success;
}
error_code
MachOObjectFile::isSectionText(DataRefImpl Sec, bool &Res) const {
uint32_t Flags = getSectionFlags(this, Sec);
Res = Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
return object_error::success;
}
error_code MachOObjectFile::isSectionData(DataRefImpl DRI, bool &Result) const {
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code MachOObjectFile::isSectionBSS(DataRefImpl DRI, bool &Result) const {
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code
MachOObjectFile::isSectionRequiredForExecution(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented.
Result = true;
return object_error::success;
}
error_code MachOObjectFile::isSectionVirtual(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code
MachOObjectFile::isSectionZeroInit(DataRefImpl Sec, bool &Res) const {
uint32_t Flags = getSectionFlags(this, Sec);
unsigned SectionType = Flags & MachO::SECTION_TYPE;
Res = SectionType == MachO::S_ZEROFILL ||
SectionType == MachO::S_GB_ZEROFILL;
return object_error::success;
}
error_code MachOObjectFile::isSectionReadOnlyData(DataRefImpl Sec,
bool &Result) const {
// Consider using the code from isSectionText to look for __const sections.
// Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
// to use section attributes to distinguish code from data.
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code
MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
bool &Result) const {
SymbolRef::Type ST;
this->getSymbolType(Symb, ST);
if (ST == SymbolRef::ST_Unknown) {
Result = false;
return object_error::success;
}
uint64_t SectBegin, SectEnd;
getSectionAddress(Sec, SectBegin);
getSectionSize(Sec, SectEnd);
SectEnd += SectBegin;
uint64_t SymAddr;
getSymbolAddress(Symb, SymAddr);
Result = (SymAddr >= SectBegin) && (SymAddr < SectEnd);
return object_error::success;
}
relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
uint32_t Offset;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Offset = Sect.reloff;
} else {
MachO::section Sect = getSection(Sec);
Offset = Sect.reloff;
}
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return relocation_iterator(RelocationRef(Ret, this));
}
relocation_iterator
MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
uint32_t Offset;
uint32_t Num;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Offset = Sect.reloff;
Num = Sect.nreloc;
} else {
MachO::section Sect = getSection(Sec);
Offset = Sect.reloff;
Num = Sect.nreloc;
}
const MachO::any_relocation_info *P =
reinterpret_cast<const MachO::any_relocation_info *>(getPtr(this, Offset));
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(P + Num);
return relocation_iterator(RelocationRef(Ret, this));
}
error_code MachOObjectFile::getRelocationNext(DataRefImpl Rel,
RelocationRef &Res) const {
const MachO::any_relocation_info *P =
reinterpret_cast<const MachO::any_relocation_info *>(Rel.p);
Rel.p = reinterpret_cast<uintptr_t>(P + 1);
Res = RelocationRef(Rel, this);
return object_error::success;
}
error_code
MachOObjectFile::getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const {
report_fatal_error("getRelocationAddress not implemented in MachOObjectFile");
}
error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
uint64_t &Res) const {
MachO::any_relocation_info RE = getRelocation(Rel);
Res = getAnyRelocationAddress(RE);
return object_error::success;
}
symbol_iterator
MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
MachO::any_relocation_info RE = getRelocation(Rel);
uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
bool isExtern = getPlainRelocationExternal(RE);
if (!isExtern)
return end_symbols();
MachO::symtab_command S = getSymtabLoadCommand();
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
DataRefImpl Sym;
Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return symbol_iterator(SymbolRef(Sym, this));
}
error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
uint64_t &Res) const {
MachO::any_relocation_info RE = getRelocation(Rel);
Res = getAnyRelocationType(RE);
return object_error::success;
}
error_code
MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const {
StringRef res;
uint64_t RType;
getRelocationType(Rel, RType);
unsigned Arch = this->getArch();
switch (Arch) {
case Triple::x86: {
static const char *const Table[] = {
"GENERIC_RELOC_VANILLA",
"GENERIC_RELOC_PAIR",
"GENERIC_RELOC_SECTDIFF",
"GENERIC_RELOC_PB_LA_PTR",
"GENERIC_RELOC_LOCAL_SECTDIFF",
"GENERIC_RELOC_TLV" };
if (RType > 5)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::x86_64: {
static const char *const Table[] = {
"X86_64_RELOC_UNSIGNED",
"X86_64_RELOC_SIGNED",
"X86_64_RELOC_BRANCH",
"X86_64_RELOC_GOT_LOAD",
"X86_64_RELOC_GOT",
"X86_64_RELOC_SUBTRACTOR",
"X86_64_RELOC_SIGNED_1",
"X86_64_RELOC_SIGNED_2",
"X86_64_RELOC_SIGNED_4",
"X86_64_RELOC_TLV" };
if (RType > 9)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::arm: {
static const char *const Table[] = {
"ARM_RELOC_VANILLA",
"ARM_RELOC_PAIR",
"ARM_RELOC_SECTDIFF",
"ARM_RELOC_LOCAL_SECTDIFF",
"ARM_RELOC_PB_LA_PTR",
"ARM_RELOC_BR24",
"ARM_THUMB_RELOC_BR22",
"ARM_THUMB_32BIT_BRANCH",
"ARM_RELOC_HALF",
"ARM_RELOC_HALF_SECTDIFF" };
if (RType > 9)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::ppc: {
static const char *const Table[] = {
"PPC_RELOC_VANILLA",
"PPC_RELOC_PAIR",
"PPC_RELOC_BR14",
"PPC_RELOC_BR24",
"PPC_RELOC_HI16",
"PPC_RELOC_LO16",
"PPC_RELOC_HA16",
"PPC_RELOC_LO14",
"PPC_RELOC_SECTDIFF",
"PPC_RELOC_PB_LA_PTR",
"PPC_RELOC_HI16_SECTDIFF",
"PPC_RELOC_LO16_SECTDIFF",
"PPC_RELOC_HA16_SECTDIFF",
"PPC_RELOC_JBSR",
"PPC_RELOC_LO14_SECTDIFF",
"PPC_RELOC_LOCAL_SECTDIFF" };
if (RType > 15)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::UnknownArch:
res = "Unknown";
break;
}
Result.append(res.begin(), res.end());
return object_error::success;
}
error_code
MachOObjectFile::getRelocationValueString(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const {
MachO::any_relocation_info RE = getRelocation(Rel);
unsigned Arch = this->getArch();
std::string fmtbuf;
raw_string_ostream fmt(fmtbuf);
unsigned Type = this->getAnyRelocationType(RE);
bool IsPCRel = this->getAnyRelocationPCRel(RE);
// Determine any addends that should be displayed with the relocation.
// These require decoding the relocation type, which is triple-specific.
// X86_64 has entirely custom relocation types.
if (Arch == Triple::x86_64) {
bool isPCRel = getAnyRelocationPCRel(RE);
switch (Type) {
case MachO::X86_64_RELOC_GOT_LOAD:
case MachO::X86_64_RELOC_GOT: {
printRelocationTargetName(this, RE, fmt);
fmt << "@GOT";
if (isPCRel) fmt << "PCREL";
break;
}
case MachO::X86_64_RELOC_SUBTRACTOR: {
DataRefImpl RelNext = Rel;
RelNext.d.a++;
MachO::any_relocation_info RENext = getRelocation(RelNext);
// X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
// X86_64_RELOC_UNSIGNED.
// NOTE: Scattered relocations don't exist on x86_64.
unsigned RType = getAnyRelocationType(RENext);
if (RType != MachO::X86_64_RELOC_UNSIGNED)
report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
"X86_64_RELOC_SUBTRACTOR.");
// The X86_64_RELOC_UNSIGNED contains the minuend symbol;
// X86_64_RELOC_SUBTRACTOR contains the subtrahend.
printRelocationTargetName(this, RENext, fmt);
fmt << "-";
printRelocationTargetName(this, RE, fmt);
break;
}
case MachO::X86_64_RELOC_TLV:
printRelocationTargetName(this, RE, fmt);
fmt << "@TLV";
if (isPCRel) fmt << "P";
break;
case MachO::X86_64_RELOC_SIGNED_1:
printRelocationTargetName(this, RE, fmt);
fmt << "-1";
break;
case MachO::X86_64_RELOC_SIGNED_2:
printRelocationTargetName(this, RE, fmt);
fmt << "-2";
break;
case MachO::X86_64_RELOC_SIGNED_4:
printRelocationTargetName(this, RE, fmt);
fmt << "-4";
break;
default:
printRelocationTargetName(this, RE, fmt);
break;
}
// X86 and ARM share some relocation types in common.
} else if (Arch == Triple::x86 || Arch == Triple::arm ||
Arch == Triple::ppc) {
// Generic relocation types...
switch (Type) {
case MachO::GENERIC_RELOC_PAIR: // prints no info
return object_error::success;
case MachO::GENERIC_RELOC_SECTDIFF: {
DataRefImpl RelNext = Rel;
RelNext.d.a++;
MachO::any_relocation_info RENext = getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
report_fatal_error("Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_SECTDIFF.");
printRelocationTargetName(this, RE, fmt);
fmt << "-";
printRelocationTargetName(this, RENext, fmt);
break;
}
}
if (Arch == Triple::x86 || Arch == Triple::ppc) {
switch (Type) {
case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
DataRefImpl RelNext = Rel;
RelNext.d.a++;
MachO::any_relocation_info RENext = getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
report_fatal_error("Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_LOCAL_SECTDIFF.");
printRelocationTargetName(this, RE, fmt);
fmt << "-";
printRelocationTargetName(this, RENext, fmt);
break;
}
case MachO::GENERIC_RELOC_TLV: {
printRelocationTargetName(this, RE, fmt);
fmt << "@TLV";
if (IsPCRel) fmt << "P";
break;
}
default:
printRelocationTargetName(this, RE, fmt);
}
} else { // ARM-specific relocations
switch (Type) {
case MachO::ARM_RELOC_HALF:
case MachO::ARM_RELOC_HALF_SECTDIFF: {
// Half relocations steal a bit from the length field to encode
// whether this is an upper16 or a lower16 relocation.
bool isUpper = getAnyRelocationLength(RE) >> 1;
if (isUpper)
fmt << ":upper16:(";
else
fmt << ":lower16:(";
printRelocationTargetName(this, RE, fmt);
DataRefImpl RelNext = Rel;
RelNext.d.a++;
MachO::any_relocation_info RENext = getRelocation(RelNext);
// ARM half relocs must be followed by a relocation of type
// ARM_RELOC_PAIR.
unsigned RType = getAnyRelocationType(RENext);
if (RType != MachO::ARM_RELOC_PAIR)
report_fatal_error("Expected ARM_RELOC_PAIR after "
"ARM_RELOC_HALF");
// NOTE: The half of the target virtual address is stashed in the
// address field of the secondary relocation, but we can't reverse
// engineer the constant offset from it without decoding the movw/movt
// instruction to find the other half in its immediate field.
// ARM_RELOC_HALF_SECTDIFF encodes the second section in the
// symbol/section pointer of the follow-on relocation.
if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
fmt << "-";
printRelocationTargetName(this, RENext, fmt);
}
fmt << ")";
break;
}
default: {
printRelocationTargetName(this, RE, fmt);
}
}
}
} else
printRelocationTargetName(this, RE, fmt);
fmt.flush();
Result.append(fmtbuf.begin(), fmtbuf.end());
return object_error::success;
}
error_code
MachOObjectFile::getRelocationHidden(DataRefImpl Rel, bool &Result) const {
unsigned Arch = getArch();
uint64_t Type;
getRelocationType(Rel, Type);
Result = false;
// On arches that use the generic relocations, GENERIC_RELOC_PAIR
// is always hidden.
if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
} else if (Arch == Triple::x86_64) {
// On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
// an X86_64_RELOC_SUBTRACTOR.
if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
DataRefImpl RelPrev = Rel;
RelPrev.d.a--;
uint64_t PrevType;
getRelocationType(RelPrev, PrevType);
if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
Result = true;
}
}
return object_error::success;
}
error_code MachOObjectFile::getLibraryNext(DataRefImpl LibData,
LibraryRef &Res) const {
report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
}
error_code MachOObjectFile::getLibraryPath(DataRefImpl LibData,
StringRef &Res) const {
report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
}
symbol_iterator MachOObjectFile::begin_symbols() const {
DataRefImpl DRI;
if (!SymtabLoadCmd)
return symbol_iterator(SymbolRef(DRI, this));
MachO::symtab_command Symtab = getSymtabLoadCommand();
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
return symbol_iterator(SymbolRef(DRI, this));
}
symbol_iterator MachOObjectFile::end_symbols() const {
DataRefImpl DRI;
if (!SymtabLoadCmd)
return symbol_iterator(SymbolRef(DRI, this));
MachO::symtab_command Symtab = getSymtabLoadCommand();
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
unsigned Offset = Symtab.symoff +
Symtab.nsyms * SymbolTableEntrySize;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return symbol_iterator(SymbolRef(DRI, this));
}
symbol_iterator MachOObjectFile::begin_dynamic_symbols() const {
// TODO: implement
report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
}
symbol_iterator MachOObjectFile::end_dynamic_symbols() const {
// TODO: implement
report_fatal_error("Dynamic symbols unimplemented in MachOObjectFile");
}
section_iterator MachOObjectFile::begin_sections() const {
DataRefImpl DRI;
return section_iterator(SectionRef(DRI, this));
}
section_iterator MachOObjectFile::end_sections() const {
DataRefImpl DRI;
DRI.d.a = Sections.size();
return section_iterator(SectionRef(DRI, this));
}
library_iterator MachOObjectFile::begin_libraries_needed() const {
// TODO: implement
report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
}
library_iterator MachOObjectFile::end_libraries_needed() const {
// TODO: implement
report_fatal_error("Needed libraries unimplemented in MachOObjectFile");
}
uint8_t MachOObjectFile::getBytesInAddress() const {
return is64Bit() ? 8 : 4;
}
StringRef MachOObjectFile::getFileFormatName() const {
unsigned CPUType = getCPUType(this);
if (!is64Bit()) {
switch (CPUType) {
case llvm::MachO::CPU_TYPE_I386:
return "Mach-O 32-bit i386";
case llvm::MachO::CPU_TYPE_ARM:
return "Mach-O arm";
case llvm::MachO::CPU_TYPE_POWERPC:
return "Mach-O 32-bit ppc";
default:
assert((CPUType & llvm::MachO::CPU_ARCH_ABI64) == 0 &&
"64-bit object file when we're not 64-bit?");
return "Mach-O 32-bit unknown";
}
}
// Make sure the cpu type has the correct mask.
assert((CPUType & llvm::MachO::CPU_ARCH_ABI64)
== llvm::MachO::CPU_ARCH_ABI64 &&
"32-bit object file when we're 64-bit?");
switch (CPUType) {
case llvm::MachO::CPU_TYPE_X86_64:
return "Mach-O 64-bit x86-64";
case llvm::MachO::CPU_TYPE_POWERPC64:
return "Mach-O 64-bit ppc64";
default:
return "Mach-O 64-bit unknown";
}
}
Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
switch (CPUType) {
case llvm::MachO::CPU_TYPE_I386:
return Triple::x86;
case llvm::MachO::CPU_TYPE_X86_64:
return Triple::x86_64;
case llvm::MachO::CPU_TYPE_ARM:
return Triple::arm;
case llvm::MachO::CPU_TYPE_POWERPC:
return Triple::ppc;
case llvm::MachO::CPU_TYPE_POWERPC64:
return Triple::ppc64;
default:
return Triple::UnknownArch;
}
}
unsigned MachOObjectFile::getArch() const {
return getArch(getCPUType(this));
}
StringRef MachOObjectFile::getLoadName() const {
// TODO: Implement
report_fatal_error("get_load_name() unimplemented in MachOObjectFile");
}
relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
DataRefImpl DRI;
DRI.d.a = Index;
return section_rel_begin(DRI);
}
relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
DataRefImpl DRI;
DRI.d.a = Index;
return section_rel_end(DRI);
}
dice_iterator MachOObjectFile::begin_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
return dice_iterator(DiceRef(DRI, this));
}
dice_iterator MachOObjectFile::end_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
unsigned Offset = DicLC.dataoff + DicLC.datasize;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return dice_iterator(DiceRef(DRI, this));
}
StringRef
MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
return parseSegmentOrSectionName(Raw.data());
}
ArrayRef<char>
MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return ArrayRef<char>(Base->sectname);
}
ArrayRef<char>
MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return ArrayRef<char>(Base->segname);
}
bool
MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
const {
if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
return false;
return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
}
unsigned MachOObjectFile::getPlainRelocationSymbolNum(
const MachO::any_relocation_info &RE) const {
if (isLittleEndian())
return RE.r_word1 & 0xffffff;
return RE.r_word1 >> 8;
}
bool MachOObjectFile::getPlainRelocationExternal(
const MachO::any_relocation_info &RE) const {
if (isLittleEndian())
return (RE.r_word1 >> 27) & 1;
return (RE.r_word1 >> 4) & 1;
}
bool MachOObjectFile::getScatteredRelocationScattered(
const MachO::any_relocation_info &RE) const {
return RE.r_word0 >> 31;
}
uint32_t MachOObjectFile::getScatteredRelocationValue(
const MachO::any_relocation_info &RE) const {
return RE.r_word1;
}
unsigned MachOObjectFile::getAnyRelocationAddress(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationAddress(RE);
return getPlainRelocationAddress(RE);
}
unsigned MachOObjectFile::getAnyRelocationPCRel(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationPCRel(this, RE);
return getPlainRelocationPCRel(this, RE);
}
unsigned MachOObjectFile::getAnyRelocationLength(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationLength(RE);
return getPlainRelocationLength(this, RE);
}
unsigned
MachOObjectFile::getAnyRelocationType(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationType(RE);
return getPlainRelocationType(this, RE);
}
SectionRef
MachOObjectFile::getRelocationSection(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
return *end_sections();
unsigned SecNum = getPlainRelocationSymbolNum(RE) - 1;
DataRefImpl DRI;
DRI.d.a = SecNum;
return SectionRef(DRI, this);
}
MachOObjectFile::LoadCommandInfo
MachOObjectFile::getFirstLoadCommandInfo() const {
MachOObjectFile::LoadCommandInfo Load;
unsigned HeaderSize = is64Bit() ? sizeof(MachO::mach_header_64) :
sizeof(MachO::mach_header);
Load.Ptr = getPtr(this, HeaderSize);
Load.C = getStruct<MachO::load_command>(this, Load.Ptr);
return Load;
}
MachOObjectFile::LoadCommandInfo
MachOObjectFile::getNextLoadCommandInfo(const LoadCommandInfo &L) const {
MachOObjectFile::LoadCommandInfo Next;
Next.Ptr = L.Ptr + L.C.cmdsize;
Next.C = getStruct<MachO::load_command>(this, Next.Ptr);
return Next;
}
MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
return getStruct<MachO::section>(this, Sections[DRI.d.a]);
}
MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
}
MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
unsigned Index) const {
const char *Sec = getSectionPtr(this, L, Index);
return getStruct<MachO::section>(this, Sec);
}
MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
unsigned Index) const {
const char *Sec = getSectionPtr(this, L, Index);
return getStruct<MachO::section_64>(this, Sec);
}
MachO::nlist
MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist>(this, P);
}
MachO::nlist_64
MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist_64>(this, P);
}
MachO::linkedit_data_command
MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
}
MachO::segment_command
MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::segment_command>(this, L.Ptr);
}
MachO::segment_command_64
MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::segment_command_64>(this, L.Ptr);
}
MachO::linker_options_command
MachOObjectFile::getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::linker_options_command>(this, L.Ptr);
}
MachO::any_relocation_info
MachOObjectFile::getRelocation(DataRefImpl Rel) const {
const char *P = reinterpret_cast<const char *>(Rel.p);
return getStruct<MachO::any_relocation_info>(this, P);
}
MachO::data_in_code_entry
MachOObjectFile::getDice(DataRefImpl Rel) const {
const char *P = reinterpret_cast<const char *>(Rel.p);
return getStruct<MachO::data_in_code_entry>(this, P);
}
MachO::mach_header MachOObjectFile::getHeader() const {
return getStruct<MachO::mach_header>(this, getPtr(this, 0));
}
MachO::mach_header_64 MachOObjectFile::getHeader64() const {
return getStruct<MachO::mach_header_64>(this, getPtr(this, 0));
}
uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
const MachO::dysymtab_command &DLC,
unsigned Index) const {
uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
return getStruct<uint32_t>(this, getPtr(this, Offset));
}
MachO::data_in_code_entry
MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
unsigned Index) const {
uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
}
MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
}
MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
}
MachO::linkedit_data_command
MachOObjectFile::getDataInCodeLoadCommand() const {
if (DataInCodeLoadCmd)
return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
// If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
MachO::linkedit_data_command Cmd;
Cmd.cmd = MachO::LC_DATA_IN_CODE;
Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
Cmd.dataoff = 0;
Cmd.datasize = 0;
return Cmd;
}
StringRef MachOObjectFile::getStringTableData() const {
MachO::symtab_command S = getSymtabLoadCommand();
return getData().substr(S.stroff, S.strsize);
}
bool MachOObjectFile::is64Bit() const {
return getType() == getMachOType(false, true) ||
getType() == getMachOType(true, true);
}
void MachOObjectFile::ReadULEB128s(uint64_t Index,
SmallVectorImpl<uint64_t> &Out) const {
DataExtractor extractor(ObjectFile::getData(), true, 0);
uint32_t offset = Index;
uint64_t data = 0;
while (uint64_t delta = extractor.getULEB128(&offset)) {
data += delta;
Out.push_back(data);
}
}
ErrorOr<ObjectFile *> ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
StringRef Magic = Buffer->getBuffer().slice(0, 4);
error_code EC;
OwningPtr<MachOObjectFile> Ret;
if (Magic == "\xFE\xED\xFA\xCE")
Ret.reset(new MachOObjectFile(Buffer, false, false, EC));
else if (Magic == "\xCE\xFA\xED\xFE")
Ret.reset(new MachOObjectFile(Buffer, true, false, EC));
else if (Magic == "\xFE\xED\xFA\xCF")
Ret.reset(new MachOObjectFile(Buffer, false, true, EC));
else if (Magic == "\xCF\xFA\xED\xFE")
Ret.reset(new MachOObjectFile(Buffer, true, true, EC));
else {
delete Buffer;
return object_error::parse_failed;
}
if (EC)
return EC;
return Ret.take();
}
} // end namespace object
} // end namespace llvm
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